no.
SteamOS is based on Arch, which is what I’m running right now.
Arch comes with the kernel, a package manager, some generic drivers to get you started, and a CLI. That’s it. Zero bloat.
It’s not “stripped down”, it’s not hobbled for the sake of extra performance, it actually has more system components than my daily driver. You can get ahold of the recovery ISO and go install it on any box, it’s not really super specialized beyond supporting video games.
“De-bloating” and “stripping down” are things Windows users do, because Windows is bloated and fucky and awful. That’s just not a thing on Linux dude.